HCLTech Network Engineer Interview Questions, Process, and Tips

Q1. What is OSPF protocol
Ans. 
OSPF (Open Shortest Path First) is a routing protocol used to determine the best path for data packets in a network.
• OSPF is a link-state routing protocol

• It uses Dijkstra's algorithm to calculate the shortest path

• OSPF routers exchange link-state advertisements (LSAs) to build a topology map of the network

• It supports VLSM (Variable Length Subnet Masking) and CIDR (Classless Inter-Domain Routing)

• OSPF is widely used in lar
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Q2. What is VPN and what's VLAN
Ans. 
VPN stands for Virtual Private Network, used to securely connect remote users or networks. VLAN stands for Virtual Local Area Network, used to segment network traffic.
• VPN allows users to securely access a private network over a public network like the internet

• VLAN divides a physical network into multiple virtual networks for better traffic management

• VPN encrypts data to ensure privacy and security during transmission

• VL...read more
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Q1. About Networking lan, wan
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Q1. Salary discussion etc..
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Q1. What is natting
Ans. 
NATting stands for Network Address Translation, a process used to modify network address information in packet headers while in transit.
• NATting allows multiple devices on a local network to share a single public IP address

• It can be used to hide the internal network structure from the outside world for security purposes

• Types of NAT include Static NAT, Dynamic NAT, and Port Address Translation (PAT)
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Q2. What is subnetting
Ans. 
Subnetting is the process of dividing a network into smaller sub-networks to improve performance and security.
• Subnetting helps in efficient utilization of IP addresses

• It allows for better network management and organization

• Subnet masks are used to determine the network and host portions of an IP address

• Example: dividing a network with IP range 192.168.1.0/24 into smaller subnets like 192.168.1.0/26 and 192.168.1.64/26
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Need to go through technical concept

Q1. CCNA-On network concepts
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Q1. Personal questions
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Q1. Routing, BGP switching
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Q2. Packet analysis
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Q1. Ha configuration on firewall
Ans. 
Configuration on firewall involves setting up rules and policies to control network traffic.
• Configure access control lists (ACLs) to allow or deny traffic based on source, destination, and port

• Set up virtual private networks (VPNs) for secure remote access

• Implement intrusion prevention systems (IPS) to detect and block malicious traffic

• Regularly update firewall firmware and review logs for security incidents
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Q2. Ipsec troubleshooting
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Q1. Asking about port no.
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Q2. Asking about osi model
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